CN103744082A - Digital multimedia broadcasting (DMB) signal-based passive radar vapor detection method - Google Patents
Digital multimedia broadcasting (DMB) signal-based passive radar vapor detection method Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
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Abstract
The invention discloses a digital multimedia broadcasting (DMB) signal-based passive radar vapor detection method, which comprises the following steps of utilizing the current commercial DMB network, synchronically generating a signal with the same frequency as and synchronous with a transmitting terminal through a DMB signal transmitter and a DMB signal receiver arranged in two places, comparing the signal at the receiving terminal with the signal transmitted by the transmitting terminal, and realizing vapor distribution characteristics, inverted by an atmospheric refractive index on a DMB signal propagation path, on different paths by using three signal processing algorithms, namely a carrier phase synchronization method, a modulation signal autocorrelation signal processing algorithm and pilot signal tracing. The vapor detection system constructed by the current commercial DMB network is adopted and is used for monitoring the atmospheric refractive index or vapor density of a boundary layer, observed results can be applied to atmospheric environment monitoring, meso- and micro-scale numerical weather prediction and smog and other disastrous weather nowcasting, and the current boundary layer vapor observation level, the temporal and spatial resolution of vapor observation and the observation accuracy are improved.
Description
Technical field
The present invention relates to field of wireless communication, particularly a kind of passive radar steam detection method based on DMB signal.
Background technology
Utilizing terrestrial DMB signal is mainly to survey the especially careful feature of inferior atmospheric layer of troposphere atmosphere, for example refractive index, humidity, temperature, atmospheric pressure and wind, having launched at present to study also the technology of certain applications is mainly the observation to steam, he be current rise and develop rapidly have potentiality, there is new technology or the atmospheric exploration new method of very large practical value, the at present domestic main method that boundary layer steam is surveyed comprises, tradition hygrometer detection method, large sunlight spectrum detecting method, laser acquisition method, radar detection method, Based Microwave Radiometer Detection method, GPS steam detection method etc., utilize commercial DMB radio signal to carry out the method for steam detection there are no research or the correlation technique application report of relevant scientific paper.
Steam is surveyed in fields such as weather forecast and scientific research, micrometeorology, diastrous weather early warning, global climate changes has very important effect, particularly in atmosphere, steam is with the feature of change in time and space to tens kilometers of left and right of meteorological process especially horizontal scale, and the prediction of the life cycle Small and Medium Sized diastrous weather system (heavy rain, hail, thunder and lightning, thick fog etc.) of several hours and monitoring have the indicative function of particular importance.But current steam detection method mainly carries out on land, accounting for more than 70% ocean and the overhead, polar region of global area, observational data famine.Aspect the steam detection of high-altitude, due to the price of arranging net of costliness, the level interval of arranging net of raob (radiosonde observation) net is in 300KM left and right, only can observe 2 every day, the spatial and temporal resolution of its observation data especially horizontal resolution far can not meet the requirement of numerical weather prediction model of future generation, can not disclose the generating process of some important mesoscale diastrous weathers, from monitoring and forecast that boundary layer steam convergence and Study of Meso Scale Weather process still have larger gap, become one of major reason that this class diastrous weather easily fails to report, and wait via satellite at present resolution and the inversion accuracy of the atmosphere vapour of other means to need to improve, relative error is larger.Current in the urgent need to expanding based on this present situation
The especially boundary layer atmosphere vapour monitoring method of horizontal resolution of atmosphere vapour, with acquisition time resolution 10 minutes to 30 minutes, horizontal scale 1km-5km horizontal resolution, the Water Vapor Observation data that the information such as profile distribution also can be provided of detection accuracy 1mm-2mm.Make up radiosondage data and the deficiency of GPS Water Vapor Observation data in time and space resolution, the needed high precision of the numerical weather forecast that becomes more meticulous, large capacity, nearly real-time atmosphere vapour information are provided.
Summary of the invention
For addressing the above problem, the invention discloses a kind of passive radar steam detection method based on DMB signal.
In order to achieve the above object, the invention provides following technical scheme: a kind of passive radar steam detection method based on DMB signal, comprises the steps:
(1), utilize the DMB network of existing commercial operation, the DMB signal boundary layer steam detection system of structure based on passive receive technology, the described DMB signal boundary layer steam detection system based on passive receive technology comprises the DMB signal projector and the DMB signal receiver that are arranged at respectively two places, described DMB signal projector comprises multiple transmitting terminals, and DMB signal receiver comprises multiple receiving ends;
(2), DMB signal projector transmitting terminal transmits, DMB signal receiver receiving end is synchronous produces one and transmitting terminal with frequently synchronous signal;
(3), utilize the signal of receiving end and the signal of transmitting terminal transmitting to compare, distance between binding signal transmitter and DMB signal receiver, ask for phase differential or time delay, in the DMB network of multiple transmitting terminals and multiple receiving end formation, receiving end according to multipath reception to signal carry out respectively the comparison of phase differential, use carrier phase synchronization method, Moisture distribution characteristics on the different paths of inverting that three kinds of signal processing algorithms of modulation signal autocorrelation signal Processing Algorithm and pilot signal tracking are realized the atmospheric refraction index in DMB signal propagation path.
As a modification of the present invention, in step (2), by GPS (GPS) or differential Global Positioning System (DGPS), guarantee that transmitting terminal synchronizes with the same frequency of receiving end.
As a modification of the present invention, gps system adopts PPP(Static Precise Point Positioning) location algorithm determines the distance between DMB signal projector and DMB signal receiver.
As a modification of the present invention, described DMB signal projector comprises Low Phase Noise Signal generator and GPS rubidium oscillator.
As a modification of the present invention, described DMB signal receiver comprises reverse sawtooth bandpass filter and 14 bit A/D converters of an arrowband.
Beneficial effect of the present invention:
The present invention is by adopting existing commercial DMB network, build a kind of DMB signal steam detection system that adopts passive reception technique, for monitoring atmospheric refraction index or the water-vapo(u)r density in boundary layer, observed result can be applicable to the diastrous weather nowcastings such as atmosphere environment supervision, Small and Medium Sized numerical weather forecast, thick fog, improved current boundary layer steam observation water flat, the time and space resolution and the accuracy of observation that improve Water Vapor Observation, be specially:
(1) the present invention is based on existing commercial DMB signal network, without rebuilding observational network, observation cost reduces greatly.
(2) DMB receiver improvement cost is cheap, and technology maturity is high, is conducive to the enforcement of large-area high-density networking.
(3) terrestrial DMB signal is that straight line or line of collimation transmit on earth's surface, without ionospheric reflection, there is no the phenomenon that in GPS Water Vapor Observation, ionosphere delay disturbs, and makes accuracy of observation higher.
(4) DMB signal Water Vapor Observation system is mainly utilized the passive reception technique of signal, therefore power consumption is very low, receiver only needs to receive sun power just can work, and can lay in the area away from electrical network, also can carry sounding balloon high-altitude steam is surveyed simultaneously.
(5) by DMB signal, resolve the method for moisture content abundant, different from gps system is the signal processing algorithm that DMB system can adopt multiple pseudo range measurement, make this system can the different calculation method of choice for use under different radio channel condition, improve detection accuracy.
(6) observational network of intensive laying and the application of chromatographic technique, can greatly improve especially horizontal resolution and the vertical resolution of the observation of boundary layer atmosphere of lower atmosphere layer, make up the blind area that GPS wrong path footpath steam is surveyed, can be combined with GPS simultaneously, optimize the tomographic results in steam tomographic results, especially boundary layer.
Accompanying drawing explanation
Fig. 1 is of the present invention based on DMB signal steam detection system schematic diagram.
Fig. 2 is atmospheric refraction index monitoring schematic diagram of the present invention.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is elaborated, should understands following embodiment and only for the present invention is described, is not used in and limits the scope of the invention.
The present invention is the DMB network that utilizes existing commercial operation, the DMB signal boundary layer steam detection system of structure based on passive receive technology, and what adopt while adopting DMB acquisition of signal steam is the technology of passive receive, by the DMB signal projector that is laid in A ground, transmitted, by the DMB signal receiver that is laid in B ground, receive signal, as shown in Fig. 1, DMB signal projector is used Rhode & Schwarz SMIO03B, Low Phase Noise Signal generator, transmission carrier frequency is the DMB signal of 890MHz, the GPS rubidium oscillator of the PRS10 model of this signal employing Stanford University is phase-locked, the clock sampling frequency Allan deviation of its ADC can reach
, receiving equipment uses GE/ICS ICS554 signal receiving device, and comprising reverse sawtooth bandpass filter and 14 bit A/D converters of an arrowband, every receiving equipment can receive the signal of the transmitting of transmitting station.
Cpm signal reception technique carry out signal propagation delay detect time and Active Radar have a great difference, it requires between transmitter and receiver, there is the synchronous mechanism of signal, requirement is by one of the synchronous generation of B receiving end and the same signal of transmitting terminal, then the signal that utilizes this signal and A transmitting terminal to launch is compared and is asked for phase differential or time delay, in the DMB network of multiple transmitting terminals and multiple receiving end formation, receiving end should be able to according to multipath reception to signal carry out respectively the comparison of phase differential, use carrier phase synchronization method, Moisture distribution characteristics on the different paths of inverting that three kinds of signal processing algorithms of modulation signal autocorrelation signal Processing Algorithm and pilot signal tracking are realized the atmospheric refraction index in DMB signal propagation path.
In order to ensure multiple equipment good synchronization operations that transmit and receive in Synchronization Network, must meet two conditions simultaneously: the one, the transmission frequency of each transmitting station is identical, and guarantee the stable of carrier frequency, the 2nd, the collection of letters number of sending out of transmitter and receiver requires high level of synchronization in time.
In order to realize the synchronous of carrier frequency, the oscillator of each transmitting station is all subject to the control of unified reference frequency, is fed to pilot tone or GPS(GPS together with program) synchronizing pulse of signal, television transmitter, be fed to the DMB data pulse of transmitting station.Except as time synchronized, through processing accordingly, also can be as the reference frequency of transmitting oscillator.In same Synchronization Network, each transmitter will be launched identical radiofrequency signal with identical frequency, and frequency error is used GPS constant temperature compensation mechanism, can make the Allan variance that transmitter transmits be less than
, meet the requirement of frequency stabilization.Generally by using GPS (GPS) or differential Global Positioning System (DGPS) to build DMB with frequency Synchronization Network, gps system is except adopting PPP(Static Precise Point Positioning) location algorithm determines the distance between DMB signal projector and DMB signal receiver, high-precision time data is also provided, DMB transmitter and receiver adopts the mode of differential received to satellite-signal, eliminate clock correction error factors, this factor may impact DMB signal retrieve low latitude atmospheric refraction index.
The disclosed technological means of the present invention program is not limited only to the disclosed technological means of above-mentioned embodiment, also comprises the technical scheme being comprised of above technical characterictic combination in any.
Claims (5)
1. the passive radar steam detection method based on DMB signal, is characterized in that: comprise the steps:
(1), utilize the DMB network of existing commercial operation, the DMB signal boundary layer steam detection system of structure based on passive receive technology, the described DMB signal boundary layer steam detection system based on passive receive technology comprises the DMB signal projector and the DMB signal receiver that are arranged at respectively two places, described DMB signal projector comprises multiple transmitting terminals, and DMB signal receiver comprises multiple receiving ends;
(2), DMB signal projector transmitting terminal transmits, DMB signal receiver receiving end is synchronous produces one and transmitting terminal with frequently synchronous signal;
(3), utilize the signal of receiving end and the signal of transmitting terminal transmitting to compare, distance between binding signal transmitter and DMB signal receiver, ask for phase differential or time delay, in the DMB network of multiple transmitting terminals and multiple receiving end formation, receiving end according to multipath reception to signal carry out respectively the comparison of phase differential, use carrier phase synchronization method, Moisture distribution characteristics on the different paths of inverting that three kinds of signal processing algorithms of modulation signal autocorrelation signal Processing Algorithm and pilot signal tracking are realized the atmospheric refraction index in DMB signal propagation path.
2. the passive radar steam detection method based on DMB signal according to claim 1, is characterized in that: in step (2), by GPS (GPS) or differential Global Positioning System (DGPS), guarantee that transmitting terminal synchronizes with the same frequency of receiving end.
3. the passive radar steam detection method based on DMB signal according to claim 2, is characterized in that: gps system adopts PPP(Static Precise Point Positioning) location algorithm determines the distance between DMB signal projector and DMB signal receiver.
4. the passive radar steam detection method based on DMB signal according to claim 1, is characterized in that: described DMB signal projector comprises Low Phase Noise Signal generator and GPS rubidium oscillator.
5. the passive radar steam detection method based on DMB signal according to claim 1, is characterized in that: described DMB signal receiver comprises reverse sawtooth bandpass filter and 14 bit A/D converters of an arrowband.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730524A (en) * | 2015-03-11 | 2015-06-24 | 马舒庆 | Array weather radar detection system and method |
| CN104865616A (en) * | 2015-05-29 | 2015-08-26 | 南京信息工程大学 | Boundary layer water vapor detection method based on multi-agent |
| CN106053490A (en) * | 2016-07-04 | 2016-10-26 | 南京信息工程大学 | Passive radar atmosphere water vapor inversion method based on 4G signals |
| CN106405574A (en) * | 2016-11-23 | 2017-02-15 | 西安兰景信息科技有限公司 | Management system of atmospheric environment monitoring laser radar |
| CN111600602A (en) * | 2020-06-12 | 2020-08-28 | 盛纬伦(深圳)通信技术有限公司 | Phase discriminator and radar system using same |
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Non-Patent Citations (1)
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730524A (en) * | 2015-03-11 | 2015-06-24 | 马舒庆 | Array weather radar detection system and method |
| CN104730524B (en) * | 2015-03-11 | 2017-05-24 | 马舒庆 | Array weather radar detection system and method |
| CN104865616A (en) * | 2015-05-29 | 2015-08-26 | 南京信息工程大学 | Boundary layer water vapor detection method based on multi-agent |
| CN104865616B (en) * | 2015-05-29 | 2017-11-24 | 南京信息工程大学 | A kind of boundary layer steam detection method based on multiple agent |
| CN106053490A (en) * | 2016-07-04 | 2016-10-26 | 南京信息工程大学 | Passive radar atmosphere water vapor inversion method based on 4G signals |
| CN106053490B (en) * | 2016-07-04 | 2019-02-05 | 南京信息工程大学 | A kind of passive radar atmosphere vapour method of inversion based on 4G signal |
| CN106405574A (en) * | 2016-11-23 | 2017-02-15 | 西安兰景信息科技有限公司 | Management system of atmospheric environment monitoring laser radar |
| CN111600602A (en) * | 2020-06-12 | 2020-08-28 | 盛纬伦(深圳)通信技术有限公司 | Phase discriminator and radar system using same |
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